And don't flavors of Linux come out almost that often?
I went to download Ubuntu Desktop last night because I'm a masochist - version 19.04 to be precise.
This is what the page says:
The latest version of the Ubuntu operating system for desktop PCs and laptops, Ubuntu 19.04 comes with nine months, until January 2020, of security and maintenance updates.
Great. 2.5 months of updates for the 'latest' version of Ubuntu.
Apparently you can download some LTS version which gives you a couple of years of updates
Somehow linux users accept this, but don't understand how different versions of a Windows desktop OS can have different end dates for support.